Aluminium oxide is impermeable and, unlike the oxide layers on many other metals, it adheres strongly to the parent metal. If damaged mechanically, aluminiumâs oxide layer repairs itself immediately.
Saliva helps remove oral waste and cavity-causing bacteria, protects teeth from decay by neutralizing harmful acids, and helps re-mineralize tooth enamel. Saliva also keeps oral tissues healthy by preventing infection by controlling bacteria and fungi in the mouth.
This is not an exact answer to your question, but I feel that many people underestimate the role saliva plays in our lives. 1. Clearance of pathogens: on average, a human being will produce 1.5 liters of saliva per day. Since the saliva is rich in glycoprotein, these will help make the bacteria stick together and ease their clearance from the oral cavity into the stomach, where they will most likely be killed by the acidic environment.